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LLC converters are extensively applied in electric vehicles (EVs) charging systems. In no-load mode, burst mode is typically employed to reduce energy loss. However, despite its power-saving benefits, burst mode introduces significant output voltage ripple. When connected to a vehicle battery, the resulting voltage difference can cause a large current overshoot, posing risks to both the battery and the charger. Fortunately, synchronous rectification (SR) in no-load mode generates minimal output voltage ripple, effectively avoiding harmful current overshoot. Although the SR in no-load mode may lead to decrease in energy loss due to circulating current, the duration of this process is negligible compared to the charging process of the EVs battery pack. Therefore, the resulting efficiency loss can be considered insignificant. A 300 kHz, 6.6 kW SiC LLC charger prototype was developed. At an output voltage of 300 V, the voltage ripple under burst control mode reaches as high as 40 V. Compared to the voltage ripple observed in burst mode, the voltage ripple under SR control is almost negligible.

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A Comparative Research of Synchronous Rectification and Burst Mode in EV Charging Applications No-Load Control

  • 会议论文

  • 发表日期：

    2025年

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  • Xin Wang,
  • Xirui Zhu,
  • Taojun Li,
  • Yihan Shi,
  • Chaohui Cui,
  • Haoran Li,
  • Cungang Hu

摘要

LLC converters are extensively applied in electric vehicles (EVs) charging systems. In no-load mode, burst mode is typically employed to reduce energy loss. However, despite its power-saving benefits, burst mode introduces significant output voltage ripple. When connected to a vehicle battery, the resulting voltage difference can cause a large current overshoot, posing risks to both the battery and the charger. Fortunately, synchronous rectification (SR) in no-load mode generates minimal output voltage ripple, effectively avoiding harmful current overshoot. Although the SR in no-load mode may lead to decrease in energy loss due to circulating current, the duration of this process is negligible compared to the charging process of the EVs battery pack. Therefore, the resulting efficiency loss can be considered insignificant. A 300 kHz, 6.6 kW SiC LLC charger prototype was developed. At an output voltage of 300 V, the voltage ripple under burst control mode reaches as high as 40 V. Compared to the voltage ripple observed in burst mode, the voltage ripple under SR control is almost negligible.